The range of resistance across the columns of stiches is about 30K Ohm. The range of resistance across the rows of stitches is about 90 K Ohm. This means that it is hard to measure multiple rows across rows, because the resistance across the columns is so much lower and so the measurements are all too similar. Measuring multiple rows across columns is possible and is demonstrated in one of the videos below.
In another example I measure from all four corners. In both examples, the common ground or VCC is attached to a little conductive fabric worn on the finger touching the knit. At one point the finger cap was a bit inconvenient and so I exchanged it for a large metal nail (my eqivalent of a pen).
My code is very very primative, so I’m sure that a lot more could be done for the smoothness of the visualization here.